[ARM][WebAssembly] Fix incorrect MCOperand::createDFPImm after D96091

Author: MaskRay

llvm/lib/Target/ARM/ARMMCInstLower.cpp

@@ -110,7 +110,7 @@ bool ARMAsmPrinter::lowerOperand(const MachineOperand &MO,
     APFloat Val = MO.getFPImm()->getValueAPF();
     bool ignored;
     Val.convert(APFloat::IEEEdouble(), APFloat::rmTowardZero, &ignored);
-    MCOp = MCOperand::createDFPImm(Val.convertToDouble());
+    MCOp = MCOperand::createDFPImm(bit_cast<uint64_t>(Val.convertToDouble()));
     break;
   }
   case MachineOperand::MO_RegisterMask:

llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp

@@ -114,7 +114,8 @@ bool parseImmediate(MCInst &MI, uint64_t &Size, ArrayRef<uint8_t> Bytes) {
       Bytes.data() + Size);
   Size += sizeof(T);
   if (std::is_floating_point<T>::value) {
-    MI.addOperand(MCOperand::createDFPImm(static_cast<double>(Val)));
+    MI.addOperand(
+        MCOperand::createDFPImm(bit_cast<uint64_t>(static_cast<double>(Val))));
   } else {
     MI.addOperand(MCOperand::createImm(static_cast<int64_t>(Val)));
   }